Table 1.
XPS determined elemental compositions for 14nm AuNP and flat Au surfaces with C6, C8, C11 and C16 COOH-SAMs. Data for AuNP samples were normalized without the Si signal and data for flat surfaces were normalized without the Zn signal, as discussed in the text.
| Atomic % (Std. Dev.)
|
|||
|---|---|---|---|
| 14nm | Flat Au | ||
| C 1s | C16 | 70.3 (0.7) | 59.5 (0.6) |
| C11 | 60.2 (2.8) | 49.0 (0.7) | |
| C8 | 53.7 (0.5) | 42.3 (0.4) | |
| C6 | 43.7 (5.5) | 38.1 (2.0) | |
|
| |||
| Au 4f | C16 | 19.2 (0.9) | 29.2 (0.6) |
| C11 | 27.0 (2.7) | 39.4 (1.6) | |
| C8 | 33.8 (1.4) | 44.3 (1.1) | |
| C6 | 44.3 (9.7) | 46.8 (2.8) | |
|
| |||
| O 1s | C16 | 9.0 (0.3) | 10.0 (0.5) |
| C11 | 10.4 (0.1) | 10.2 (1.0) | |
| C8 | 9.5 (1.4) | 11.7 (0.7) | |
| C6 | 8.0 (4.3) | 13.0 (1.7) | |
|
| |||
| S 2p | C16 | 1.5 (0.0) | 1.3 (0.0) |
| C11 | 2.3 (0.0) | 1.5 (0.1) | |
| C8 | 3.0 (0.0) | 1.7 (0.2) | |
| C6 | 4.0 (0.1) | 2.1 (0.3) | |